Deburring Copper Pipe?

Another_Level

Tbh, have only deburred  copper when the pipes are used for gas 

Have seen the effects on copper pipe cut with a manual screw down type cutter, where the operator has been heavy handed and created a massive internal burr's 

Rothenberger auto pipe slices work well, sometimes as already mentioned swarf may form inside the pipe. Its usually extremely sharp just pick it out with a screwdriver if necessary.

Just lightly clean the new copper pipe end with wire wool, try not to gouge/scratch or reduce the diameter of the pipe which will be relatively clean already and the flux will do the rest. 
New solder fittings will be clean enough, no need for cleaning.

Soldering, so last season